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Sufficiency is an area of law that increasingly gives rise to difficulties for patentees and applicants. Whilst some years ago a successful challenge for lack of sufficiency was a rare event, increasingly the EPO is finding a lack of validity under this ground. In this webinar, we will consider the law surrounding sufficiency in particular in relation to the biotechnology and chemical fields. We will also consider strategies that can be used by those on both sides of the sufficiency debate.